"can't think of one good reason to get out of bed today...." she wrote, adding: "for everyone asking... I have never been so hurt in my life.

"My heart has never been so broken..... Lila my sweet baby girl has passed away."

Cyrus described herself as "broken", saying: "Gonna go MIA for a bit. Need some healing time. Thank you to everyone who has sent love my way. I need it."

She has since uploaded an image of herself with Lila, explaining: "can't sleep. I miss my baby girl...."

Ellen DeGeneres was among those offering their sympathy to Cyrus, writing on her Twitter page: "Thinking about my friend @MileyCyrus. I was so sorry to hear about her dog, Lila. She was a very sweet puppy."